<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<button onclick="foo()">隔10s关闭页面</button>
		<button onclick="foo2()" id="btn2">倒数10s</button>
		<script>
			//setTimeout(要执行的代码，间隔时间)
			function foo(){
				setTimeout(function()
				{
					close();
				},10000);
			}
			var n=10;
			function foo2()
			{
				if(n>0){
				n=n-1
				btn2.textContent="倒数"+n+"s";
				setTimeout(foo2,1000);
				}
			}
		</script>
	</body>
</html>